Thicker fork oil is one of the worst things for these forks, they suffer from harshness that is caused by a damping system that is very simple. The thicker fluid causes this to get worse. Really, you have to try a bike with the forks set up correctly to appreciate what they can be.
I feel that the way mine are set up is quite good. I went from Gold Valves, and racetech springs, then to a totally different rebound stack and finally to the Penske conversion that I do (this takes a couple custom parts). They are very good. Better than the Traxxion Dynamics worked forks on my 748. I think I can make them better with TiNi coating and hard anodizing but doubt the cost would be justified. I may do it anyhow! 